my bad. was looking at the tranny pan. the oil pan is the same as F350. Looks good, no rust. did the oil change. that poor oil pan must be made of very light sheet metal. if you torque the drain plug just a little hard, you can see it's being distorted! Also, checked everywhere, still no rust, even the rocker panel, wheel well.If it’s rust free then it probably has been replaced. Hopefully they did the manifolds at the same time as well as the rear main seal